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```Origami Flying Disk

.1

Make Projects

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Origami Flying Disk

Written By: Cy Tymony

f

/ TOOLS:

PARTS:

Scissors (1)

Paper (1 piece)

Taped)

Step 1 — Demonstrate Bernoulli's principle.

• Cut a paper strip 1 / 2 "x4". Hold the
paper strip just below your lips, and
blow above the strip. The paper will
rise!

• This occurs because of

Bernoulli's principle — fast-
moving air has lower pressure than
non-moving air. The still air below
the strip has higher pressure than
the moving air above, so it pushes
the strip upward.

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Origami Flying Disk

Step 2 — Try another quick test.

• Cut 2 paper strips 1 /2 M x4". Hold them about 2" apart and blow air between them. You expect
them to blow apart, but they actually come together. Bernoulli's principle is working here
because the faster-moving air between the strips has lower pressure than the air outside
them, which therefore pushes them together.

• The top of an airplane wing curves upward and has a longer surface than the
bottom. When the plane moves, the air moving along the top must travel farther and
faster than the air moving past the straight bottom. The faster-moving top air has less
pressure than the bottom air. This provides lift.

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Origami Flying Disk

Step 3 — Make an origami flying disc.

• Now use your newfound Bernoulli
principle knowledge to make a
flying disc using only paper and
tape.

• Cut eight 2"x2" square pieces of
paper. Fold the top right corner of
one square down to the lower left
corner. Then fold the top left corner
down to the lower left corner to
create a small triangular pocket.
Repeat these two folds with the
remaining 7 squares.

• Insert one paper figure into the left
pocket of another. Insert the
figures into each other until they
form an 8-sided disc. Hold the disc
firmly together while you apply tape
as required.

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Origami Flying Disk

Step 4

• Fly it.

• Turn the disc over and toss it like a
Frisbee. You'll see that it glides a
bit, but then drops rapidly. The
reason is that the top and bottom
surfaces are straight.

• Now bend down the outer edges to
form a curved lip as shown in the
image on the lower right. This
should produce the Bernoulli effect.

• Throw the flyer with a quick snap of
your wrist, and it should stay aloft
for a much greater distance.

This project first appeared in MAKE Volume 10 . page 167.

This document was last generated on 2012-10-31 11 :04:35 PM.